Alkaline Earth Based Borosilicate Glasses as Sealants in Solid Oxide Fuel Cell Applications
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Alkaline earth based glasses of composition 35AO – 50B2O3 – 15SiO2 (A = Ba, Ca, Sr) was prepared by conventional melt quenching technique. Density of the glasses was measured using Archimede’s method. X-ray diffraction patterns confirmed the amorphous nature of the glasses. This result was supported by scanning electron microscope (SEM) image. The structure of the glasses was investigated by FT-IR spectroscopy. FT-IR spectrum revealed the characteristic bands due to various borate and silicate structural units. FT-Raman spectroscopy was used to investigate the characteristic bands of these glasses and its changes due to the presence of various alkaline earth metals. The microhardness of the glass samples was measured by indentation technique. Microhardness of all glasses were high (6.9–7.1) GPa, reflecting higher bond strength. The co-efficient of thermal expansion (CTE) were measured and lie within the range (8–10) × 10–6o C−1, which was in good agreement with that of the other SOFC components.
KeywordsBorosilicate glass Density XRD FT-IR Co-efficient of thermal expansion
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The authors would like to acknowledge SAIF, Cochin, Kerala for providing the XRD facility. The authors are also thankful to SICC, University of Kerala for the SEM image. The authors are grateful to Dr. I. Ibnusaud, IIRBS, M.G. University, Kottayam for FT-IR analysis. Authors are also thankful to SAIF, M.G. University, Kottayam for FT-Raman analysis. The authors are also thankful to Dr. Ratheesh, C-MET, Thrisur for CTE analysis.
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